A fluke goal by William Gallas and an own goal by Gary Caldwell gave Arsenal a 2-0 victory at Glasgow Celtic on Tuesday night in the first leg of the final qualifying round for the European Champions League.

Cesc Fabregas’ 30-yard free kick in the 43rd minute deflected off Gallas’ backside and into the net at Celtic Park, and Caldwell accidentally redirected a cross from Arsenal defender Gael Clichy past his own goalkeeper in the 71st minute. “Despite having control of the game we scored two lucky goals,” said Arsenal manager Arsene Wenger. “But we had plenty of opportunities.”

The teams meet again at Arsenal next week in the second leg of the total-goals series.